Q 2
Identify terms which contain x2 and give the coefficients of x2. a) 2x2 + 5y
b) 3x2y + 13xy2 + 2y2
Q How much does 9x2 + 7x – 2 exceed to 4x2 + 3x + 1?
Q What should be taken away from 3a2 – 4b2 + 5ab + 20 to obtain –a2 – b2 +6ab + 20?
Q Simplify:
3q2 + 5q – 4) – (8q – q2 – 4)
3a –2b – ab – (a – b – ab) + 3ab + b – a
Q From the sum of 4a2 – 6a + 3 and – 4a2 – 7a + 5, subtract 3a2 – 8a + 6.
COMPARING QUANTITIES
Q1. Express the 2 hours to 300 minutes as ratios in the simplest form
Q2.
(i) What per cent of 5kg is 50g? ( (ii) Find 21/2 % of 320 people.
Q3. Convert: (1x6=6)
i)Fraction into percent:
a) 8/125
ii)Percent into fraction: a)0.06%
iii)Percent as ratio:
a) 7.5%
iv)Ratio to percent:
a) 3:5
v)Percent to decimal:
a) 3.6%
vi)Decimal to percent:
a) 0.0005
Q4. In an examination,72% of the total examinees passed. if the number of failures is 492, find the total number of examinees.
Q5.Find the selling price of an article for which the cost price is Rs 750 and gain is 8%.
Q6. What percent is :
a) 36 minutes of 2 hours (b) 25 paisa of Rs 6
Answers
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Answer:
questions 6
2 hours =120minutes
36/120×100 =30
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